#root(3)(20x^2y^7)*root(3)(50x^4y^2)# = ?

A) #20^(1/3)(50^(1/3))x^(6)y^9#
B) #70^(1/3)x^(2)y^3#

C)#10x^(8/3)y^(14/3)#
D)#10x^2y^3#
E)#1000x^(8/3)y^(14/3)#